Video of FT4 talk by Joe Taylor K1JT

Discussion in 'Amateur Radio News' started by G4TUT, Apr 26, 2019.

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  1. G4TUT

    G4TUT Ham Member QRZ Page

    Video of FT4 talk by Joe Taylor K1JT

    On March 15, Joe Taylor K1JT gave a talk on the new digital mode FT4 to the Fair Lawn amateur radio club

    "Soon after the "FT8 Roundup" held on December 1-2, 2018, we started serious work on a faster, more contest-friendly digital mode that can compete with RTTY-contesting QSO rates while preserving many of the benefits of FT8. The result is FT4 -- a new digital mode specifically designed for radio contesting.

    Over the past month a small group of volunteers have been conducting on-the-air tests of FT4. The early tests were very successful and helped us to make a number of important design decisions. We believe FT4 has considerable promise for its intended purpose.

    We'll soon be ready for testing by a larger group. If you might be interested in participating and offering your considered feedback, please read the descriptive document "The FT4 Protocol for Digital Contesting"
    http://physics.princeton.edu/pulsar/k1jt/FT4_Protocol.pdf

    We plan to post downloadable installation packages for WSJT-X 2.1.0-rc5
    on April 29. The document linked above includes
    - Instructions for installing WSJT-X 2.1.0-rc5 and FT4 configuration
    - Operating instructions for FT4
    - Basic description of the FT4 protocol, modulation, and waveform
    - Detailed sensitivity measurements for FT4 under a wide variety of simulated propagation
    conditions
    - Schedule for upcoming test sessions

    Please consider helping us to make FT4 a successful mode for digital contesting

    With best wishes and 73,
    -- Joe K1JT, Steve K9AN, and Bill G4WJS"

    Watch Dr. Taylor - FT8 & Beyond: FT4 - Finale, this mode is 3x Faster than FT8




    http://www.southgatearc.org/news/2019/april/video-of-ft4-talk-by-joe-taylor-k1jt.htm

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    KK6JKC, W4RAV, KX1MAD and 1 other person like this.
  2. KK5JY

    KK5JY Premium Subscriber QRZ Page

    That was an interesting talk.

    It's good to see them finally get away from external clocking.
     
  3. VA3VF

    VA3VF Ham Member QRZ Page

    I read somewhere that clocking is back, as the initial tests were not promising.
     
    WU8Y likes this.
  4. VA3VF

    VA3VF Ham Member QRZ Page

    Found the comment:

    "At about 20 minutes into the video presentation, Joe describes FT4 as being asynchronous, meaning that you can start transmitting any time you wish, rather than being synchronized to an accurate clock. That asynchronous method did not work out as well as expected in on-the-air testing, and was abandoned.

    The version of FT4 that will be coming out on Monday is synchronous, on a 6-second cycle, and requires a more accurate clock than FT8. One thing that you can do now, before the program release on Monday, is to make sure that your computer clock is as accurate as possible. The Meinberg NTP program is recommended by K1JT for keeping your clock accurate https://www.meinbergglobal.com/english/sw/ntp.htm

    You can check the accuracy of your computer clock by going to www.time.is

    Dave Hachadorian, K6LL"

    I was never a fan of Meinberg. I see no reason why D4, BktTimeSync, and others would not work.
     
    WU8Y, W4RAV and N6SPP like this.
  5. N5WX

    N5WX XML Subscriber QRZ Page

    Thank you for the URL to check my computer accuracy. Mine was .027.
     
  6. VA3ECO

    VA3ECO Ham Member QRZ Page

    As always, a fantastic presentation by Joe.
    The Pulsar story at the end was fascinating.
    -Chris VA3ECO
     
    N6SPP likes this.
  7. KK5JY

    KK5JY Premium Subscriber QRZ Page

    That's a shame.

    That said, it's a hard problem to solve well. A significant portion of the SNR of the modem receiver depends on good clock recovery.
     
  8. W1YW

    W1YW Ham Member QRZ Page

    Thanks for the gift of yet another new mode, Joe!
     
    K8XG and N4QX like this.
  9. VK3VM

    VK3VM XML Subscriber QRZ Page

    The only real reliable way to keep your PC hyper-accurately synchronised is via the multiple constellation of atomic clocks whizzing around us in Low Earth Orbit.... i.e. The GPS Satellite constellation.

    Some say HAM's have their pockets sewn up when it comes to spending; By far the CHEAPEST and MOST RELIABLE way from my extensive experimentation in the area (for other purposes) to access accurate, consistent time synchronisation is with NMEATime2 ( http://www.visualgps.net/#nmeatime2-content ) and a $15 U-Blox module off EBay (i.e. https://www.ebay.com/sch/i.html?_from=R40&_nkw=ublox+dongle&_sacat=0&_sop=15 ).

    [ Minor correction: I note that some devices i.e. VK-172 [UBlox 7-based] can be purchased from China through EBay for around $US10 delivered ]

    No I am not a salesman for such products; these products just work - and work well - from my ongoing practical experience in both fixed and portable operational environments.

    .....

    And I echo the sentiments of others in expressing gratitude and thanks for the plethora of new modes that are surfacing - the modes that some claim are destroying AR but really are invigorating and modernising AR and its thinking !

    My thinking in many of these areas has changed ! I will admit to not being in favor of the "automation" in activity initially - but now I can see that it is mandatory and I am now sold on the concept.
     
    Last edited: Apr 27, 2019
    KK6JKC, WU8Y, KB2HSH and 3 others like this.
  10. VK3MH

    VK3MH XML Subscriber QRZ Page

    FYI we VK's work NA and SA on VHF every summer on FT8 and JT65. 73 VK3MH
     
    NR5O likes this.

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